Wisdom, in short, whose lessons have been represented as so hard to learn by those who were never at her school, teaches us only to extend a simple maxim universally known and followed even in the lowest life, a little farther than that life carries it. And this is not to buy at too dear a price.
Now, whoever takes this maxim abroad with him into the grand market of the world, and constantly applies it to honors, to riches, to pleasures, and to every other commodity which that market affords, is, I will venture to affirm, a wise man; and must be so acknowledged in the worldly sense of the word: for he makes the best of bargains, since in reality he purchases everything at the price of a little trouble, and carries home all the goods I have mentioned, while he keeps his health, his innocence and his reputation, the common prices which are paid for them by others, entire and to himself.
~ Henry Fielding: The History of Tom Jones, a Foundling (1749).
Probably the most important lesson one can ever learn: wealth and success are important, but not as important as your health, your family, your friends and your reputation.